288 POLYGONACEAE 



N. Y. Southern shore of L. I. and on S. I. Unknown elsewhere. 

 N. J. Near Paterson, thence increasing southward, but not in the 



pine-barrens. 



Rare and local; its center of distribution uncertain. 



5. R. mexicanus Meisn. Newf. to B. C, Me., Tex. and Mex., 



locally introduced eastward. 

 Occasional in waste ground. 



6. R. altissimus Wood. Along streams and in swamps: Conn. 



to Neb., Md. and Texas. 



Conn. Rare and local in waste places perhaps adventive from the 



West. 

 N. Y. Not common; a weed in waste places. 

 N. J. Locally as a weed near Hoboken, Jersey City and 



Newark. 



Rare or wanting elsewhere. 



7. R. Patientia L. Waste places: Me. and Ont. to Wis., south 



to Conn., Pa. and Kan. Also in the far west. Naturalized 

 from Europe. 

 Locally as a weed. 



8. R. Britannica L. In swamps and wet soil: N. B. and Ont. to 



Minn., N. J., Pa., 111. and Neb. 



Throughout the range in ecologically favorable habitats; not 

 reported from the pine-barrens of L. I. and N. J. 



9. R. crispus L. In fields and waste places: nearly throughout 



N. Am. Naturalized from Eu. Native of Asia. 



Abundant as a troublesome weed in most parts of the range. 



10. R. sanguineus L. In waste places and on ballast: S. N. Y. 



to Va. Naturalized from Europe. 



Uncommon and local weed. Not recently collected. 



11. R. pulcher L. Waste places: Va. to Fla. and La. Also on 



the Pacific coast and in ballast about the eastern seaports. 

 Locally rare as an occasional weed. 



12. R. obtusifolius L. Waste places: N. S. to N. B. to Ore., south 



to Fla. and Tex. Naturalized from Eu. Native also in 

 Asia. 



Locally abundant as a weed. 



